exam Maths Puzzle Numerical Ability

Let y vary directly with x, with a constant of variation k = 3. Graph the equation of variation.

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exam Other Question

Solve the formula for the given variable.
PV=nRT;T

Please, Please show me all the work. Cause I do not understand this at all. (ab)^8 + 3(ab)^4 + 2
factor each polynomial. state prime if needed.